采用累计贡献率的方法，结合PCA的尺度不变特征变换(SIFT)算法，包括邓氏关联度、绝对关联度、斜率关联度、改进绝对关联度。- The method of cumulative contribution rate Combined with PCA scale invariant feature transform (SIFT) algorithm, Including Deng s correlation, absolute correlation, correlation of slope, improved absolute correlation.